High Bandwidth Measurement of Partial Discharge Current Pulses Based on the Optimized Needle-plate Electrode System

In order to obtain the nanosecond partial discharge pulse current signal of needle-plate electrode, a new measurement method of wideband PD pulse current is proposed in this paper. By the numerical calculation of current parameters, the optimized needle-plate electrode structure and the accurate finite element simulation, the experimental platform of the fast PD pulse current detection is set up and its bandwidth is up to 1.81GHz. The testing results indicate that, the established detection system has the some advantages, i.e., high sensitivity, good frequency response characteristics, strong anti-disturbance capability and virtually no waveform distortion, which lays the foundation for further researching the relation between the macroscopic PD pulse current waveform and the microcosmic discharge process.